import store from '@/store'
import config from '@/config'
import {
	getToken
} from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import {
	toast,
	showConfirm,
	tansParams
} from '@/utils/common'

let timeout = 10000
const baseUrl = config.baseUrl

/**
 * 请求拦截
 * @param {*} config 
 * @returns 
 */
const request = config => {
	// 是否需要设置 token
	const isToken = (config.headers || {}).isToken === false
	// 确保 config.header 是一个对象
	config.header = config.header || {}

	// 获取请求key防止水平越权
	config.header['requestKey'] = getRequestKey()
	// 设定请求traceId
	config.header['TRACE_ID'] = getTraceId()

	if (getToken() && !isToken) {
		// config.header['Authorization'] = 'Bearer ' + getToken()
		config.header['Authorization'] = getToken()
	}
	// get请求映射params参数
	if (config.params) {
		let url = config.url + '?' + tansParams(config.params)
		url = url.slice(0, -1)
		config.url = url
	}

	return new Promise((resolve, reject) => {
		uni.request({
			method: config.method || 'get',
			timeout: config.timeout || timeout,
			url: config.baseUrl || baseUrl + config.url,
			data: config.data,
			header: config.header,
			dataType: 'json'
		}).then(response => {
			// console.log('响应信息', JSON.stringify(response));
			let [error, res] = response
 
			if (error) {
				toast('后端接口连接异常')
				reject('后端接口连接异常')
				return
			}		 	

			const code = res.data.code || 200
			const msg = errorCode[code] || res.data.message || errorCode['default']

			if (res.statusCode === 401) {
				showConfirm('登录状态已过期，您可以继续留在该页面，或者重新登录?').then(res => {
					if (res.confirm) {						 
						// 登录过期跳转登录页面
						uni.reLaunch({
							url: '/pages/login/login'
						})
					}
				})
				reject('无效的会话，或者会话已过期，请重新登录。')
			} else if (code === 500) {
				toast(msg)
				reject('500')
			} else if (code !== 200) {
				toast(msg)
				reject(code)
			}
			resolve(res.data)
		}).catch(error => {
			let { message } = error
			if (message === 'Network Error') {
				message = '后端接口连接异常'
			} else if (message.includes('timeout')) {
				message = '系统接口请求超时'
			} else if (message.includes('Request failed with status code')) {
				message = '系统接口' + message.substr(message.length - 3) + '异常'
			}
			toast(message)
			reject(error)
		})
	})
}

/**
 * 获取请求key防止水平越权
 * @returns 请求key
 */
function getRequestKey() {
	const now = new Date()
	return Math.floor(now.getTime() / 1000)
}

/**
 * 获取uuid
 * @returns
 */
function getTraceId() {
	const uuid = ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
		(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
	)
	return uuid.replace(/-/g, '')
}

export default request